Yes, the KIT 60 is actually 1/6th of a turn, it needs the additional parts to fit up properly, the OEM cables aren't long enough to get the necessary slack. I'm not sure but I think you need a larger grip housing as well. That is why those kits are more expensive. (a few hundred dollars for all the parts)
I would also put it in the "track only" catagory for most riders, it's twichy and takes time to get used to.
the 1/5th was designed with a few considerations in mind.
1. Use all the OEM parts, nothing else to buy.
2. reduce the throw to what most people can do in a single grip.
3. be reversable.
the 1/5th fits all those criteria.